Banding press



Dec. 17, 1940.

A. B. LAMOREAUX BANDING PRES S 3. Sheet's-Sheet 2 Filed Sept. 17, 1938Mms/s INVENTOR. W

Y TTORNEY.

Main/9,6,5 34

Dec. 17; 1 940. LAMQREAUX 2,225,345

YBANDING PRESS FileciSept. 17, 1938 3 Sheets-Sheet 3 v 29 v 4 3 i? 9? 412 12 Patented Dec. 17, 1940 BANDKNG PRESS Application September 1'7,1938, Serial No. 236,501

8 Claims.

The present invention relates to a banding press and more particularlyto a power press having a segmental circular die for applying circularbands to cylindrical objects.

In the manufacture of cylindrical containers for traversing tubularconveyers under the impulsion of compressed gas, it is customaryto'provide the container with one or more circular bands of relativelysoft material to-serve as bearing and packing rings. When the containeris a steel projectile arranged to be discharged from a rifle barrel,such bands are commonly formed of copper and perform the additionalfunction of engaging the rifling of the gun barrel to cause 15 rotationof the projectile when-discharged.

In order to secure the necessary tightness and rigidity of connection ofthe copper bands to projectiles, it is usual to form a seat in theperiphery of the projectile to receive the band, such seat beingroughened and flared inwardly; and. the band is forced into the seatwith sufficient pressure to cause the band to conform itself closely tothe surfaces of the seat. As heretofore performed, this operationrequired the use of large and heavy presses which were comparativelyslow acting, and several actuations of the press such as eight or morewere necessary'to secure an acceptable seating of the band. Thisrepeated working of the copper *band caused it to become undesirablyhardened, thus inducing unnecessary wear-on the ruling of theg-unbarrel.

It is an object of the present invention to provide anovel compressibledie for-applying circular bands toc-ylindrical articles, which iseflicient 35 and reliable in operation while being simple and economicalin construction.

It is another object to provide such a device which is arranged to beused in a punch press of ordinary construction, and when so used is ar-40 ranged to apply peripheral pressure to a deformable ring to seat itin a groove in the article to be banded.

It is a further object to provide such a device which is arranged toconvert the vertical pres- ,4 sure of the punch press ram intoperipheralcom- 55 hand.

Further objects and advantages will be apparent from the followingdescription taken in connection with the accompanying drawings in which:

Fig. l is a side elevation partly in vertical section of a preferredembodiment of the invention as used in conjunction with the ram andbolster plate of a conventional type of punch press;

Fig. 2 is a section taken substantially on the line 22'of Fig. 1,showing the parts in the positions assumed at the beginning of thecompression of the band;

Fig. 3 is a vertical sectional view of the die and ram showing the partsin fully retracted position; 11

Fig. 4 is a view similar to Fig. 3 showing the parts in fully compressedposition;

Fig. 5 is a detail in perspective of one sliding die segment and itsspring; and

Fig. 6 is a detail in perspective of the central I bearing member forthe work with its supporting plate and indexing handle.

In Fig. -1 of the drawings there is illustrated a platform or bolsterplate I of a punch press, and a ram 2 located above the platform andarranged to be reciprocated toward and from the platform by anyconventional operating mechanism. Since the punch press may be of anyconventional type, and the operating mechanism therefor forms no part ofthe present invention, furtherillustration of the punch press mechanismis deemed unnecessary.

According to the present invention a base plate -3 is centrally mountedon the bolster I as by .means of cap screws 4 (Fig. 2), and aswingingcarrier plate 5 is .pivotallyconnected to the base plate 3 as by meansof a stud 6. Manually operable means such as a handle 1 is provided forswinging the carrier plate 5 into and out of its centralized positionbeneath the ram v2, the operative position of the plate being defined bysuitable means such as a stop pin 8.

A circular banding die comprising an annular framemember 9 is rigidlymounted on the carrier plate 5 as by means of studs .H in position to becentrally located'beneath the ram 2 when the carrier is-in operativeposition as defined by its stop -8. The interior of the frame 9 isprovided with a plurality of downwardly and inwardly inclined guidewaysI 2, and a plurality of sag-.1 mental die blocks l3 are slidablymountedin the guideways and arranged so that when they are pressed intothe die frame by the ram 2 as illustrated in Fig. 4, the interiorsurfaces of the blocks form a hollow cylinder.

A central vertical bearing member I4 having a tapered work-supportingsurface I5 is slidably mounted in the die frame 9 by means of a circularsupporting plate I5 loosely fitting in a cylindrical opening I! in thebottom of the die frame. Means are provided for normally maintaining thebearing member in its upper position with the supporting plate bearingagainst a shoulder I8 in the die frame, as illustrated in Fig. 3, in theform of a plurality of compression springs I9 seated in the carrierplate 5. The die blocks I3 are normally maintained in their retractedposition as illustrated in Fig. 3 by means of expansive springs 2I(Figs. 1 and 2) seated in recesses in said blocks. Depression of theblocks by the ram causes the lower ends of the blocks to engage the topof the supporting plate I5 as.

shown in Fig. 1, after which the die blocks and central bearing memberI4 move downwardly as a unit to the fully compressed position of Fig. 4.Means for indexing the bearing member I4 in order to rotate the workslightly between operative strokes is provided in the form of a handle22 (Fig. 2) attached to the supporting plate IB and having freedom forlimited arcuate movement in an opening 23 in the side of the die frame9.

Means are provided for transmitting pressure from the ram 2 to the dieblocks I3 in the form of a pressure block 24 having a stem 25 mounted ina recess 26 in the ram, and having a fiat annular face 21 adapted toengage the tops of the die blocks I3. A recess 28 is centrally locatedin the pressure block 24 to provide clearance for the top of the work.Means are preferably provided for yieldably pressing the work onto thework-supporting bearing member I4 in the form of a piston member 29slidably mounted in the center of the. pressure block 24 and arranged tonormally extend below the pressure block as illustrated in Fig- 3 so asto engage thev work before the pressure block engages the die blocks I3.A spring 3I is provided for yieldably holding the piston 29 in extendedposition as defined by abutment means 32.

Means for dislodging the work from its seat on the tapered portion l5 ofthe work holder I4 is provided in the form of a plunger rod 33 slidablymounted in the interior of the work holder I4. and adapted to be struckby a bar 34 slidably mounted in the base plate 3. The .bar 34 isretained in the base plate by suitable means such as a plate 35 fixed asillustrated at 36 to the bolster I, forming a guide for the bar 34 andarranged to engage a retaining pin 31 in said bar to define its idleposition. It will be understood that the bar 34 may be operated by atreadle or any other suitable mechanism, not illustrated.

Means are preferably provided in the die blocks l3 for engaging the bandand applying localized pressure thereto-in order to assist in assuringthat the band conforms itself tightly to the surfaces of its seat in thework. As here shown, this means comprises arcuate hard metal inserts 38in the blocks arranged adjacent the ends of the band and projectingslightly inwardly from the surfaces of the blocks in order to in Fig. 4.

As here illustrated, the work consists of a cylindrical shell 39 havinga central opening 4| tapered at its upper end to seat on the taperedportion I5 of the support l4. A groove 42 is provided in the surface ofthe work for receiving a band 43 of deformable material such as copper,said groove being preferably undercut and knurled in order to provide asecure anchorage for the band.

In the operation of the device, a band 43 is manually applied to thework 39, being slid on the work into registry with the groove 42. Theregistry of the band with the groove may be maintained if desired bystriking the band with a soft hammer sufficiently to deform it into aslightly oval shape, causing it to partly enter the groove. The die isswung out from under the ram 2 by means of the handle I, and the work isdropped into the die onto its seat on the work support I4. The die isthen swung back into operative position by the handle I and the ram isactuated in the usual manner, causing the pressure block 24 to belowered. The plunger 29,.first engages the top of the work 39,yieldingly pressing it onto its seat, after which the surface 21 of thepressure block 24 engages the die blocks I3 and moves them downwardlyalong the guideways I2 until the lower ends thereof engage thesupporting plate I8 as illustrated in Fig. 1. At this time the inserts38 in the die blocks I3 start to engage the band 43, and further travelof the ram 2 causes the die blocks I3, the work support I4, the work 39and band 43 to be traversed downwardly as a unit while the die blocksmove inwardly, compressing the band firmly into its seat 42 as shown inFig. 4. The subsequent upward movement of the ram 2 permits the parts ofthe die to return to their retracted position by virtue of the springsI9 and 2|, whereupon the releasing bar 34 is actuated to cause theplunger 33 to strike the interior of the work and loosen it from itsseat. The bar 34 is then permitted to drop and the die swung out fromthe press to permit removal of the work.

Where it is desired to repeat the operation of the press in order tosmooth up the exterior surface of the band, it is customary to index thework holder I4 by means of the handle 22 between the strokes of the ramin order to facilitate the removal of the slight ridges left in the bandat the edges of the die blocks.

It will be understood that during the compression of the band in thedie, the interior of the work is supported and prevented from beingconstricted by virtue of the close fit of the tapered portion I5 of thework support in the interior of the work. Since the pressure exerted inthe banding operation is quite high, it is preferred to form the worksupport I4 of hardened steel in order to prevent the possibility of anydeformation of the work by the pressures exerted by the die.

Although but one form of the invention has been shown and describedindetafl,it will be understood that other embodiments are possible andvarious changes may be made in the dimensions and arrangement of theparts without departing from the spirit of the invention as defined inthe claims appended hereto.

What is claimed is:

1. In a banding press, a die including a horizontal annular frame havingdownwardly and adapted to engage the blocks and force them down in theframe, and spring means arranged to be compressed by downward motion ofthe support under pressure from said blocks.

2. In a banding press, a bolster plate, a circular stationary die framemounted thereon having inclined guideways, segmental die blocks slidablymounted in said guideways, a central bearing member adapted to receiveand hold the article to be banded, a yielding support therefor in thepath of movement of said blocks, and a pressure block adapted to engagesaid die blocks and move them along the guideways, said die blocks beingarranged to engage the support upon initial movement thereof, afterwhich the support, the work and the die blocks are translated in unisonby the pressure block, while the die blocks close in on and compress thework by reason of the inclination of the guideways.

3. In a banding press, a bolster plate, a stationary circular die framemounted thereon having inclined guideways, segmental die blocks slidablymounted in said guideways, a central bearing member adapted to receiveand hold the article to be banded, a yielding support therefor adaptedto be engaged and moved by said blocks, a pressure block adapted toengage said die blocks and move them along the guideways, and a yieldingplunger in the pressure block adapted to engage the work and press itdown on the bearing member.

4. In a banding-press, a bolster plate, a stationary circular die framemounted thereon having inwardly inclined guideways, segmental die blocksslidably mounted in said guideways, a central bearing and reenforcingmember having a tapered seat adapted to receive and hold the article tobe banded, a yielding support therefor adapted to be engaged and movedby said blocks, a pressure block adapted to engage said die blocks andmove them along the guideways, and movable means in the bearing memberfor engaging and removing the work therefrom.

5. In a compressive die for a banding press, an interiorly taperedstationary annular frame, a plurality of segmental blocks slidablymounted in the frame, a central work holder in the frame adapted to beengaged and moved by said blocks, yielding means urging the work holderto a normal position in the frame, and springs between the blocksnormally maintaining them spaced from the work holder.

6. In a banding die for hollow shells, a stationary frame, a centralbearing member within said frame formed to fit and support a shell to bebanded, a plurality of blocks slidably mounted in inclined guideways inthe frame and having means for engaging and compressing a band on theshell, a common yielding support for said bearing member adapted to beengaged and moved by said blocks, means for yieldingly pressing theshell on the bearing member, and a ram engaging the blocks to move theminto engagement with the support and thereafter to move the block, shelland support in unison in the frame.

7. In a banding die for hollow shells, a stationary horizontal annularframe having downwardly and inwardly inclined guideways, a centralvertical bearing member within said frame formed to fit and support theinterior of a shell to be handed, a plurality of die blocks slidablymounted in the inclined guideways and having means for engaging andcompressing a band on the shell, a common support for said bearingmember adapted to be engaged and moved by said blocks, means foryieldingly pressing the shell on the bearing member, a ram engaging theblocks to move them into engagement with the support and thereafter tomove the block,

shell and support in unison with the frame, and

yielding means for raising said support and for separating said blocks.

8. In a press, a banding die including a stationary horizontal annularframe having down- 'wardly and inwardly inclined guideways, a cen-

